Abstract: A portable hand-held vaporizer assembly having a body shaped to fit substantially within a standard-sized clothing pocket, the body including an airflow chamber, the airflow chamber having a distal end and a proximal end; and a spiral body coupling the distal end to the proximal end. The spiral body defines a spiral airflow passage in fluid communication with an outside environment, winding about an area, and being at least partially encapsulated within the body. The distal end defines a distal opening that places the spiral airflow passage in fluid communication with the outside environment. The assembly further includes a heating element thermally coupled to the spiral glass body and disposed within the area about which the spiral body winds. A substance placement zone is downstream from the spiral airflow passage and in fluid communication with the spiral airflow passage.